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/***************************************************************************

 *   Copyright (C) December 10, 2008 by Mattias Runge                             *

 *   mattias@runge.se                                                      *

 *   virtualmachine.cpp                                            *

 *                                                                         *

 *   This program is free software; you can redistribute it and/or modify  *

 *   it under the terms of the GNU General Public License as published by  *

 *   the Free Software Foundation; either version 2 of the License, or     *

 *   (at your option) any later version.                                   *

 *                                                                         *

 *   This program is distributed in the hope that it will be useful,       *

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *

 *   GNU General Public License for more details.                          *

 *                                                                         *

 *   You should have received a copy of the GNU General Public License     *

 *   along with this program; if not, write to the                         *

 *   Free Software Foundation, Inc.,                                       *

 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *

 ***************************************************************************/

#include <map>

#include "virtualmachine.h"

VirtualMachine* VirtualMachine::myInstance = NULL;

VirtualMachine& VirtualMachine::getInstance()

{

    if (myInstance == NULL)

    {

        myInstance = new VirtualMachine();

    }

    return *myInstance;

}

void VirtualMachine::deleteInstance()

{

    if (myInstance != NULL)

    {

        delete myInstance;

        myInstance = NULL;

    }

}

VirtualMachine::VirtualMachine()

{

}

VirtualMachine::~VirtualMachine()

{

}

void VirtualMachine::run()

{

    SyslogStream &slog = SyslogStream::getInstance();

    string basePath = Settings::get("BasePath") + "/Services/System/";

    string scriptName = "Base.js";

    string scriptFileName = basePath + scriptName;

    if (!file_exists(scriptFileName))

    {

        slog << "Failed to load :" << scriptFileName << "\n";

    }

    string scriptSource = file_get_contents(scriptFileName);

    Handle<String> source =  String::New(scriptSource.c_str(), scriptSource.length());

    //each script name must be unique , for this demo I just run one embedded script, so the name can be fixed

    Handle<String> name = String::New(scriptName.c_str(), scriptName.length());

    // Create a template for the global object.

    myGlobal = ObjectTemplate::New();

    //associates "print" on script to the Print function

    myGlobal->Set(String::New("log"), FunctionTemplate::New(VirtualMachine_log));

    myGlobal->Set(String::New("sendCanMessage"), FunctionTemplate::New(VirtualMachine_sendCanMessage));

    myGlobal->Set(String::New("loadScript"), FunctionTemplate::New(VirtualMachine_loadScript));

    myGlobal->Set(String::New("setTimeout"), FunctionTemplate::New(VirtualMachine_setTimeout));

    myGlobal->Set(String::New("setInterval"), FunctionTemplate::New(VirtualMachine_setInterval));

    myGlobal->Set(String::New("clearTimeout"), FunctionTemplate::New(VirtualMachine_clearInterval));

    myGlobal->Set(String::New("clearInterval"), FunctionTemplate::New(VirtualMachine_clearInterval));

    //create context for the script

    myContext = Context::New(NULL, myGlobal);

    //access global context within this scope

    Context::Scope context_scope(myContext);

    //exception handler

    TryCatch try_catch;

    //compile script to binary code - JIT

    Handle<Script> script = Script::Compile(source, name);

    //check if we got problems on compilation

    if (script.IsEmpty())

    {

        // Print errors that happened during compilation.

        String::AsciiValue error(try_catch.Exception());

        slog << "Failed to compile script: " << *error << "\n";

    }

    else

    {

        //no errors , let's continue

        Handle<Value> result = script->Run();

        //check if execution ended with errors

        if (result.IsEmpty())

        {

            // Print errors that happened during execution.

            String::AsciiValue error(try_catch.Exception());

            slog << "Constructor: Failed to run script: " << *error << "\n";

        }

        else

        {

            loadScript("System/Service.js");

            loadScript("System/ServiceManager.js");

            loadScript("System/CanMessage.js");

            loadScript("System/CanManager.js");

            loadScript("System/CanService.js");

            loadScript("System/Startup.js");

            if (file_exists(basePath + "Autostart.js"))

            {

                loadScript("Autostart.js");

            }

            myFunctionHandleHeartbeat = Handle<Function>::Cast(myContext->Global()->Get(String::New("handleHeartbeat")));

            myFunctionOfflineCheck = Handle<Function>::Cast(myContext->Global()->Get(String::New("offlineCheck")));

            myFunctionHandleMessage = Handle<Function>::Cast(myContext->Global()->Get(String::New("handleMessage")));

            myFunctionStartup = Handle<Function>::Cast(myContext->Global()->Get(String::New("startup")));

        }

    }

    const int argc = 0;

    Handle<Value> argv[argc] = { };

    Handle<Value> result = myFunctionStartup->Call(myFunctionStartup, argc, argv); // argc and argv are your standard arguments to a function

    mySemaphore.lock();

    while (1)

    {

        string expression;

        while (myExpressions.size() > 0)

        {

            expression = myExpressions.pop();

            runExpression(expression);

        }

        CanMessage canMessage;

        while (myCanMessages.size() > 0)

        {

            canMessage = myCanMessages.pop();

            if (canMessage.isHeartbeat())

            {

                callHandleHeartbeat(stoi(canMessage.getData()["HardwareId"].getValue()));

            }

            else

            {

                callHandleMessage(canMessage);

            }

        }

        mySemaphore.wait();

    }

    mySemaphore.unlock();

}

void VirtualMachine::queueCanMessage(CanMessage canMessage)

{

    myCanMessages.push(canMessage);

    mySemaphore.broadcast();

}

void VirtualMachine::queueExpression(string expression)

{

    myExpressions.push(expression);

    mySemaphore.broadcast();

}

bool VirtualMachine::loadScript(string scriptName)

{

    SyslogStream &slog = SyslogStream::getInstance();

    string basePath = Settings::get("BasePath") + "/Services/";

    string scriptFileName = basePath + scriptName;

    if (!file_exists(scriptFileName))

    {

        slog << "Failed to load :" << scriptFileName << "\n";

        return false;

    }

    string scriptSource = file_get_contents(scriptFileName);

    Handle<String> source =  String::New(scriptSource.c_str(), scriptSource.length());

    //each script name must be unique , for this demo I just run one embedded script, so the name can be fixed

    Handle<String> name = String::New(scriptName.c_str(), scriptName.length());

    //access global context within this scope

    Context::Scope context_scope(myContext);

    //exception handler

    TryCatch try_catch;

    //compile script to binary code - JIT

    Handle<Script> script = Script::Compile(source, name);

    //check if we got problems on compilation

    if (script.IsEmpty())

    {

        // Print errors that happened during compilation.

        String::AsciiValue error(try_catch.Exception());

        slog << "Failed to compile script: " << *error << "\n";

        return false;

    }

    else

    {

        //no errors , let's continue

        Handle<Value> result = script->Run();

        //check if execution ended with errors

        if (result.IsEmpty())

        {

            // Print errors that happened during execution.

            String::AsciiValue error(try_catch.Exception());

            slog << "loadScript: Failed to run script: " << *error << "\n";

            return false;

        }

    }

    return true;

}

void VirtualMachine::callHandleHeartbeat(int hardwareId)

{

    const int argc = 1;

    Handle<Value> argv[argc] = { Integer::New(hardwareId) };

    Handle<Value> result = myFunctionHandleHeartbeat->Call(myFunctionHandleHeartbeat, argc, argv); // argc and argv are your standard arguments to a function

}

void VirtualMachine::callHandleMessage(CanMessage canMessage)

{

    const int argc = 6;

    Handle<Value> argv[argc] = {String::New(canMessage.getClassName().c_str()),

                                String::New(canMessage.getDirectionFlag().c_str()),

                                String::New(canMessage.getModuleName().c_str()),

                                Integer::New(canMessage.getModuleId()),

                                String::New(canMessage.getCommandName().c_str()),

                                String::New(canMessage.getJSONData().c_str()) };

    Handle<Value> result = myFunctionHandleMessage->Call(myFunctionHandleMessage, argc, argv); // argc and argv are your standard arguments to a function

}

int VirtualMachine::setInterval(string expression, int interval, bool single)

{

    IntervalThread intervalThread(expression, interval, single);

    intervalThread.start();

    int timeoutId = myTimers.size();

    myTimers[timeoutId] = intervalThread;

    myTimers[timeoutId].start();

    return timeoutId;

}

bool VirtualMachine::clearInterval(int timeoutId)

{

    if (myTimers.find(timeoutId) != myTimers.end())

    {

        myTimers.erase(timeoutId);

        return true;

    }

    return false;

}

bool VirtualMachine::runExpression(string expression)

{

    SyslogStream &slog = SyslogStream::getInstance();

    string scriptName = "runExpression";

    Handle<String> source =  String::New(expression.c_str(), expression.length());

    //each script name must be unique , for this demo I just run one embedded script, so the name can be fixed

    Handle<String> name = String::New(scriptName.c_str(), scriptName.length());

    //access global context within this scope

    Context::Scope context_scope(myContext);

    //exception handler

    TryCatch try_catch;

    //compile script to binary code - JIT

    Handle<Script> script = Script::Compile(source, name);

    //check if we got problems on compilation

    if (script.IsEmpty())

    {

        // Print errors that happened during compilation.

        String::AsciiValue error(try_catch.Exception());

        slog << "Failed to compile script: " << *error << "\n";

        return false;

    }

    else

    {

        //no errors , let's continue

        Handle<Value> result = script->Run();

        //check if execution ended with errors

        if (result.IsEmpty())

        {

            // Print errors that happened during execution.

            String::AsciiValue error(try_catch.Exception());

            slog << "runExpression: Failed to run script: " << *error << "\n";

            return false;

        }

    }

    return true;

}

Handle<Value> VirtualMachine_log(const Arguments& args)

{

    SyslogStream &slog = SyslogStream::getInstance();

    String::AsciiValue str(args[0]);

    slog << *str;

    return Undefined();

}

Handle<Value> VirtualMachine_sendCanMessage(const Arguments& args)

{

    SyslogStream &slog = SyslogStream::getInstance();

    CanNetManager &canMan = CanNetManager::getInstance();

    CanMessage canMessage;

    String::AsciiValue className(args[0]);

    canMessage.setClassName(*className);

    String::AsciiValue directionFlag(args[1]);

    canMessage.setDirectionFlag(*directionFlag);

    String::AsciiValue moduleName(args[2]);

    canMessage.setModuleName(*moduleName);

    canMessage.setModuleId(args[3]->Uint32Value());

    String::AsciiValue commandName(args[4]);

    canMessage.setCommandName(*commandName);

    String::AsciiValue dataString(args[5]);

    vector<string> parts = explode(",", trim(*dataString, ','));

    map<string, CanVariable> data;

    for (int n = 0; n < parts.size(); n++)

    {

        vector<string> keyAndValue = explode(":", parts[n]);

        //string key = trim(keyAndValue[0], ' ');

        //string value = trim(keyAndValue[1], ' ');

        data[keyAndValue[0]] = CanVariable(keyAndValue[0], keyAndValue[1]);

    }

    canMessage.setData(data);

    canMan.sendMessage(canMessage);

    return Undefined();

}

Handle<Value> VirtualMachine_loadScript(const Arguments& args)

{

    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue str(args[0]);

    return Boolean::New(vm.loadScript(*str));

}

Handle<Value> VirtualMachine_setInterval(const Arguments& args)

{

    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue expression(args[0]);

    unsigned int interval = args[1]->Uint32Value();

    return Integer::New(vm.setInterval(*expression, interval, false));

}

Handle<Value> VirtualMachine_setTimeout(const Arguments& args)

{

    VirtualMachine &vm = VirtualMachine::getInstance();

    String::AsciiValue expression(args[0]);

    unsigned int interval = args[1]->Uint32Value();

    return Integer::New(vm.setInterval(*expression, interval, true));

}

Handle<Value> VirtualMachine_clearInterval(const Arguments& args)

{

    VirtualMachine &vm = VirtualMachine::getInstance();

    return Boolean::New(vm.clearInterval(args[0]->Uint32Value()));

}